Conservationists began a tree sit on July 29 to protect the last historic cottonwood tree in Lochiel, Arizona, threatened by President Trump's border wall construction. This tree, part of a rare and century-old group, supports diverse wildlife including endangered species and serves as a vit…
The federal government is expected to approve a water cut proposal from California, Arizona, and Nevada, but additional deeper cuts could follow, severely impacting Arizona’s water supplies including the Central Arizona Project and agricultural areas like Yuma.
Arizona climber Aaron Collins creates bolted rock climbing routes, blending artistry, safety and legacy on cliffs that generations of climbers may enjoy.
Lakes Mead and Powell are storing barely more water today than Lake Mead alone did in 1957 — at a time when construction on the dam that would create Lake Powell had barely started.
The Nature Conservancy has acquired a spring-fed oasis for endangered fish and other rare wildlife between Sonoita and Patagonia.
The federal government has accepted a plan proposed by Arizona, California and Nevada that will cut Arizona's Colorado River supply by 31% over the next two years, the Los Angeles Times reports.
A Tucson recycling and green waste facility says it has stopped providing water to construction crews at the Project Blue data center construction site after public backlash.
Tucson Water could lose as little as 6% to as much as nearly 85% of its total Colorado River-based drinking water supplies, depending on how big a cut the entire Central Arizona Project takes from the depleted river, Arizona State University researchers have found.
Armed with a $198,000 state grant, two volunteer groups will be expanding their ongoing efforts to control buffelgrass and other invasive plants at Catalina State Park.
The U.S. Fish and Wildlife Service has downlisted the razorback sucker from endangered to threatened, citing growth in fish populations that the agency says has reduced the risk to the species.
In a decision handed down this week, the Arizona Department of Water Resources determined that Tucson can keep its 100-year assured water supply designation.
For Star subscribers: A critical minerals mine in the Patagonia Mountains received final approval from federal regulators, but the mine's construction schedule has slipped and costs have soared by more than $1 billion.
The Charleston gauge, long considered a key indicator of the San Pedro River's health, dried up late last month for the first time in two decades.
The $3 billion South 32 Hermosa project will unearth deposits of zinc, manganese, lead and silver buried in the Patagonia Mountains.
Almost 700 acres of grasslands and oak trees once proposed for residential development has been added to the Coronado National Forest in the Catalina Mountains near Oracle.
Tucson Water and others that take Central Arizona Project water will be spared deep cuts — at least for now — if the U.S. approves a 2-year plan.
A new Arizona water report says only about 3% of the state’s precipitation reaches groundwater aquifers. Researchers recommend expanding stormwater capture, recharge projects and forest management efforts to help offset water losses driven by drought and climate change.
For Star subscribers: A new agreement signed by federal officials and leaders of water agencies in Arizona, California and Nevada could eventually lead to the transfer of potentially large amounts of Colorado River water between states.
Judge Scott Blaney's ruling Tuesday marked the second time in t wo months he has overturned efforts by the Arizona Department of Water Resources to
It could take 100 years and cost more than $24.5 million to save the Mount Graham red squirrel, according to a revised recovery plan for the endangered rodent.
A Tucson-based environmental group is accusing the Trump administration of moving at a snail's pace in determining whether a sesame-sized mollusk found only in Organ Pipe Cactus National Monument in southwest Arizona should be listed as endangered.
The federal funding for the Arizona cleanup is part of a national $1 billion annual appropriation that the former Biden-Harris administration earmarked for PFAS and emerging contaminants
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Arizona MVD has added digital text boxes and emergency contact fields so drivers can voluntarily share communication needs with first responders during incidents.
Arizona DOT’s 10th Safety Message Contest invites the public to submit traffic safety sign ideas by Aug. 4, with top-voted messages displayed on highway boards.
Learn how to safely offer ground-level water in backyard bowls for Sky Island wildlife, including placement, depth, cleaning, and conflict considerations.
Arizona DOT joins the multistate “Check Your Height, Know It’s Right” campaign, urging drivers to know vehicle height, heed low bridge signs and prevent strikes.
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For Star subscribers: Tucson and Phoenix have a plan in which city with more water than it needs at the moment can share it.
For Star subscribers: Wildlife officials are planning an emergency rescue for an endangered species that could see its only U.S. habitat wiped out by construction of a second border wall across Southern Arizona.
The Project Blue data center will use groundwater from two new wells being drilled on the property.
The endangered Sonoyta pupfish has apparently disappeared from its native range in Mexico, leaving just one remaining wild population at Quitobaquito Springs in southwestern Pima County.
Nearly 75 groups and other entities representing a wide range of interests want Congress to pony up at least $2 billion to invest in water conservation and efficiency programs and "smart, targeted" projects to increase available supplies in the drought-stricken Colorado River Basin.
A judge in Maricopa County is trying to determine who is the rightful owner of a winning The Pick ticket that was printed at a Scottsdale Circle K but was not purchased that day.
Opponents of the Copper World mining project in the Santa Rita Mountains have placed a lien on 160 acres of state land that mine developer Hudbay Minerals Inc. purchased to keep the land from being developed for now.
Arizona, Nevada and California would still have to take massive cuts in their Colorado River water supplies under a new, preliminary plan devised by the U.S. Bureau of Reclamation, Arizona water officials said Wednesday.
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Tucson business halts water sales to Project Blue contractor
